<template>
  <transition name="el-fade-in-linear el-fade-in">
    <div class="code-preview-wrapper" v-show="visible"
      @keydown.s.ctrl.prevent="handleModifyFileContent">
      <!-- 顶部信息栏 & 工具栏 -->
      <div class="tip-wrapper" v-if="visible">
        <div class="name" :title="$file.getFileNameComplete(fileInfo)">
          {{ $file.getFileNameComplete(fileInfo) }}
          <span class="un-save"
            v-show="isModify && !codeMirrorOptions.readOnly">（未保存）</span>
        </div>
        <div class="editor-preveiw">
          在线预览{{ codeMirrorOptions.readOnly ? '' : ' & 编辑' }}
        </div>
        <div class="tool-wrapper">

          <el-tooltip effect="dark" placement="bottom">
            <div slot="content">
              操作提示: <br />
              1. 按 Esc 键可退出查看；<br />
              2. 支持在线编辑、保存、下载
            </div>
            <div class="item text-wrapper">
              <span class="text">操作提示</span>
              <i class="el-icon-s-opportunity"></i>
            </div>
          </el-tooltip>
          <i class="item el-icon-close" title="关闭预览"
            @click="closeCodePreview"></i>
        </div>
      </div>
      <!-- 代码编辑区域 -->
      <div class="code-editor-wrapper">
        <div class="operate-wrapper">
          <i class="save-icon iconfont icon-baocun" title="保存（ctrl+s）"
            v-show="isModify && !codeMirrorOptions.readOnly"
            @click="handleModifyFileContent"></i>
          <el-form class="editor-set-form" :model="codeMirrorOptions"
            :inline="true" size="small" label-position="right" label-suffix=":">
            <el-form-item label-width="0px" class="line-wrapper">
              <el-checkbox v-model="codeMirrorOptions.lineWrapping"
                @change="handleChangeCodeMirrorOption">自动换行</el-checkbox>
            </el-form-item>
            <el-form-item label-width="0px" class="font-size">
              <el-select v-model="codeMirrorCustomOptions.fontSize" filterable>
                <el-option v-for="(item, index) in fontSizeList" :key="index"
                  :value="item" :label="`${item} px`"></el-option>
              </el-select>
            </el-form-item>
            <el-form-item label-width="80px" label="代码语言" class="lanaguage">
              <el-select v-model="codeMirrorOptions.mode" filterable
                @change="handleChangeCodeMirrorOption">
                <el-option v-for="(value, key, index) in fileSuffixCodeModeMap"
                  :key="index" :value="value[1].mime"
                  :label="value[1].language"></el-option>
              </el-select>
            </el-form-item>
            <el-form-item label="主题" label-width="56px" class="theme">
              <el-select v-model="codeMirrorOptions.theme" filterable
                @change="handleChangeCodeMirrorOption">
                <el-option value="default" label="default"></el-option>
                <el-option v-for="(item, index) in codeMirrorThemeList"
                  :key="index" :label="item" :value="item"></el-option>
              </el-select>
            </el-form-item>
          </el-form>
        </div>
        <codemirror class="code-editor" ref="codemirrorRef"
          v-model="codeMirrorText" :options="codeMirrorOptions"
          v-loading="codeMirrorLoading" v-if="isShow"
          :style="`font-size: ${codeMirrorCustomOptions.fontSize}px;`" />
      </div>
    </div>
  </transition>
</template>

<script>
// vue-codemirror 相关，官网地址：https://github.com/surmon-china/vue-codemirror
import { codemirror } from 'vue-codemirror'
import 'codemirror/lib/codemirror.css' // codemirror 样式
import './theme.js' //  codemirror 高亮代码主题
import './mode.js' // codemirror 的解析语言模式
import './fold.js' //  codemirror 的代码折叠功能相关
import {
  fontSizeList,
  fileSuffixCodeModeMap,
  codeMirrorThemeList
} from '@/libs/map.js'
// 文件修改相关
import store from '@/store/index.js'
import { getFilePreview, modifyFileContent } from '_r/file.js'

export default {
  name: 'ImgPreview',
  components: {
    codemirror
  },
  data() {
    return {
      fontSizeList,
      fileSuffixCodeModeMap,
      codeMirrorThemeList,
      visible: false, // 代码预览遮罩层组件是否显示
      originalCodeText: '', // 代码原本的文本
      codeMirrorText: '', // 代码实时修改的文本
      codeMirrorLoading: false, // 代码内容是否加载中
      // codemirror 配置项，参考 https://codemirror.net/doc/manual.html#config
      codeMirrorOptions: {
        tabSize: 4, //  制表符的宽度。默认为 4。
        mode: 'text/html', //  解析当前代码的模式，参考 https://codemirror.net/mode/ 每种语言的示例页面的底部都有对应的 MIME 类型，如果当前文件后缀没有匹配的语言，按照 html 来解析
        theme: 'default', //  代码高亮主题色，其他主题色参考 https://codemirror.net/theme/
        readOnly: true, //  true 只读不可编辑 | false 可编辑 | "nocursor"（而不是简单的 true ），不允许编辑器聚焦。
        lineNumbers: true, //  是否在编辑器左侧显示行号
        line: true,
        autoCloseBrackets: true, //  自动补全括号
        foldGutter: true, //  创建带有指示可折叠块的标记的装订线
        lineWrapping: true, //  长行处理：false 滚动 | true 换行
        // 额外的装订线
        gutters: [
          'CodeMirror-linenumbers',
          'CodeMirror-foldgutter',
          'CodeMirror-lint-markers'
        ]
      },
      isShow: true, //  codemirror 是否展示
      // codemirror 自定义配置项
      codeMirrorCustomOptions: {
        fontSize: 14
      }
    }
  },
  computed: {
    // 屏幕宽度
    screenWidth() {
      return store.state.common.screenWidth
    },
    // 是否修改
    isModify() {
      return this.originalCodeText !== this.codeMirrorText
    }
  },
  watch: {
    // 监听代码查看组件 显隐状态变化
    visible(val) {
      if (val) {
        // codemirror 解析模式设置
        let fileSuffix = this.fileInfo.extendName.toLowerCase()
        if (fileSuffix === 'yaml') {
          fileSuffix = 'yml'
        }
        if (this.fileSuffixCodeModeMap.has(fileSuffix)) {
          this.codeMirrorOptions.mode =
            this.fileSuffixCodeModeMap.get(fileSuffix).mime
        }
        this.codeMirrorOptions.readOnly = !this.isEdit //  设置编辑器是否只读
        // codemirror 主题获取
        this.codeMirrorOptions.theme =
          localStorage.getItem('zut_file_codemirror_theme') || 'default'
        this.getCodeText()
        // 添加键盘 Esc 事件
        this.$nextTick(() => {
          document.addEventListener('keyup', (e) => {
            if (e.keyCode === 27) {
              this.closeCodePreview()
            }
          })
        })
      } else {
        document.removeEventListener('keyup', (e) => {
          if (e.keyCode === 27) {
            this.closeCodePreview()
          }
        })
      }
    },
    // 监听主题变化
    'codeMirrorOptions.theme'(val) {
      localStorage.setItem('qiwen_file_codemirror_theme', val)
    }
  },
  methods: {
    /**
     * 获取代码文本内容
     */
    getCodeText() {
      this.codeMirrorLoading = true
      getFilePreview({
        userFileId: this.fileInfo.userFileId,
        filePath: this.fileInfo.filePath,
        extendName: this.fileInfo.extendName
      }).then((res) => {
        this.codeMirrorLoading = false
        this.originalCodeText =
          typeof res === 'object' ? JSON.stringify(res) : res
        this.codeMirrorText = this.originalCodeText + ''
      })
    },
    /**
     * 修改代码文本内容
     */
    handleModifyFileContent() {
      // 如果没有修改，或当前为只读状态
      if (!this.isModify || this.codeMirrorOptions.readOnly) {
        return false
      }
      this.codeMirrorLoading = true
      modifyFileContent({
        userFileId: this.fileInfo.userFileId,
        fileContent: this.codeMirrorText
      })
        .then((res) => {
          this.codeMirrorLoading = false
          if (res.success) {
            this.$message.success('已保存')
            this.getCodeText()
          } else {
            this.$message.error(res.message)
          }
        })
        .catch((err) => {
          this.codeMirrorLoading = false
          this.$message.error(err.message)
        })
    },
    /**
     * codemirror 配置项改变时触发
     */
    handleChangeCodeMirrorOption() {
      this.isShow = false
      this.isShow = true
    },
    /**
     * 关闭代码预览
     */
    closeCodePreview() {
      this.visible = false
      this.callback('cancel')
    }
  }
}
</script>

<style lang="stylus" scoped>
@import '~_a/styles/varibles.styl';
@import '~_a/styles/mixins.styl';

.code-preview-wrapper {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  overflow: auto;
  width: 100%;
  height: 100vh;
  z-index: 2;
  display: flex;
  align-items: center;
  animation: imgPreviewAnimation 0.3s;
  -webkit-animation: imgPreviewAnimation 0.3s; /* Safari and Chrome */
  animation-iteration-count: 0.3;
  -webkit-animation-iteration-count: 0.3;
  animation-fill-mode: forwards;
  -webkit-animation-fill-mode: forwards; /* Safari 和 Chrome */
  @keyframes imgPreviewAnimation {
    0% {
      background: transparent;
    }
    100% {
      background: rgba(0, 0, 0, 0.8);
    }
  }
  @keyframes imgPreviewAnimation {
    0% {
      background: transparent;
    }
    100% {
      background: rgba(0, 0, 0, 0.8);
    }
  }
  .tip-wrapper {
    position: fixed;
    top: 0;
    left: 0;
    z-index: 2;
    background: rgba(0, 0, 0, 0.5);
    padding: 0 48px;
    width: 100%;
    height: 48px;
    line-height: 48px;
    color: #fff;
    font-size: 16px;
    display: flex;
    justify-content: space-between;
    .name {
      flex: 1;
      padding-right: 16px;
      text-align: left;
      overflow: hidden;
      text-overflow: ellipsis;
      white-space: nowrap;
      .un-save {
        color: $Warning;
        font-size: 14px;
      }
    }
    .tool-wrapper {
      flex: 1;
      display: flex;
      justify-content: flex-end;
      .item {
        margin-left: 16px;
        height: 48px;
        line-height: 48px;
        cursor: pointer;
        &:hover {
          opacity: 0.7;
        }
      }
      .download-link {
        color: inherit;
        font-size: 18px;
      }
      .text-wrapper {
        .text {
          margin-right: 8px;
        }
      }
    }
  }

  .code-editor-wrapper {
    margin: 56px auto 0 auto;
    width: 90vw;
    height: calc(100vh - 80px);
    .operate-wrapper {
      display: flex;
      justify-content: space-between;
      align-items: center;
      border-radius: 8px 8px 0 0;
      border-bottom: 1px solid $BorderBase;
      padding: 8px 16px;
      background: #fff;
      .save-icon {
        font-size: 20px;
        cursor: pointer;
        color: $Info;
        font-weight: 550;
        &:hover {
          opacity: 0.5;
        }
      }
      .editor-set-form {
        flex: 1;
        text-align: right;
        >>> .el-form-item {
          margin-bottom: 0;
          &.font-size {
            .el-form-item__content {
              .el-select {
                width: 96px;
              }
            }
          }
          &.lanaguage {
            .el-form-item__content {
              .el-select {
                width: 120px;
              }
            }
          }
          &.theme {
            .el-form-item__content {
              .el-select {
                width: 190px;
              }
            }
          }
        }
      }
     }
    .code-editor {
      height: calc(100vh - 129px);
      >>> .CodeMirror {
        border-radius: 0 0 8px 8px;
        height: inherit;
        font-size: inherit;
        * {
          font-family: SFMono-Regular,Consolas,Liberation Mono,Menlo,Courier,monospace !important;
        }
        .CodeMirror-vscrollbar,
        .CodeMirror-hscrollbar {
          display: none !important;
        }
        .CodeMirror-scroll {
          width: 100%;
          padding: 8px 0 0 0;
          line-height: 1.5;
          font-size: inherit;
          setScrollbar(12px, transparent, #C0C4CC);
        }
      }
    }
  }

}
</style>
